Filter.



No. 638,663. Patented Dec. 5, I899. J. ELLIS.

FILTER.

=App1ication filed. Nov 22, 1898.]

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UNITED STATES PATENT OFFTCE.

JOHN ELLIS, OF LYNN, MASSACHUSETTS.

FILTER.

SPECIFICATION forming part of Letters Patent No. 638,663, dated December5, 1899.

Application filed November 22, 1898. Serial No. 697,164. (No model.)

To all whom it may concern:

Be it known that 1, JOHN ELLIS, of Lynn, in the county of Essex andState of Massachusetts, have invented certain new and usefulImprovements in Filters, of which the following is a full, clear, andexact description.

This invention relates to a filter, more especially intended for thefiltering of Water,wliich is very simple in its construction, can bemade at a very small cost, and yet is as practical and satisfactory inits operation as a more expensive filter; and the invention consists ofa filter for filtering water and other liquids, all constructedsubstantially as hereinafter fully described, reference being had to theaccompanying sheet of drawings, in which Figure 1 is a central verticalsection of the filter, and Fig. 2 is a cross-section on line 2 2, Fig.1.

In the drawings, A represents a casing inclosing the filtering material13 and other parts of the filter and having an external screw-thread Oon each end. This casing is made of one piece from a plain straight tubeand is formed into the shape and outline shown by spinning it intosuchform. It is spun to leave central portion D straight and forcedradially inward to make a partial closing of the case at E, forming aninternal shoulder F, from which the sides continue in a straight portionG and formin g another shoulder H of larger diameter and the out-side ateach end having the screw-thread 0 formed thereon. Both ends of thecasing from the central portion are made alike, as shown.

Placed within the casing, resting on the shoulderF,is a perforated plateK, and resting or bearing against this perforated plate Kis a cup-shapedpiece L, having a central hole or opening through it, the edge N of thecut resting against the perforated plate K,and against the outer side ofthis ring-cup L is placed a fiat ring P, of elastic material, such asindiarubber, resting against the shoulder H and which is of a diameterpreferably a little larger than the internal diameter of the casing atsuch place, so that when pressed into its seat or shoulder it will fitclosely and firmly therein to hold the perforated plate and cup-shapedring in place.

The central portion of the filter-case be tween the two perforatedplates is filled with the filtering material B, which can be of anysuitable material for such purpose.

The filter being constructed the same at each end is as usual infilters.

At the central portion D the casing is cir-' cuinferentially grooved,somewhat as at Q, to provide a roughened surface for a better hold uponthe filter in screwing it on or off the water-faucet or other holder.

By spinning up the casing into the shape and with the shoulder andscrewthreads formed thereon as described the casing can be made of onepiece and at a very small cost. The cup-shaped ring gives a smallchamber between it and the perforated plate and having a smaller hole oropening through it the stream of water as it passes through is caused torun in a smooth and steady stream.

Having thus described my invention, what I claim isv 1. A filter-casingspun up from a tube, provided with internal shoulders F H and anexternal screw-thread onthe end.

2. A filter, consisting of a casingA having an external screw-thread onits end, shoulders F and H, a perforated plate against the shoulder F acup-shaped ring resting by its edges against the perforated plate and anelastic ring next the cup-shaped ring and bearing on the shoulder H.

In testimony whereof I have hereunto set my hand in the presence of twosubscribing witnesses.

JOHN ELLIS. v

Witnesses:

EDWIN W. BROWN, ARTHUR P. GOLDTHWAIT.

